I'm an assistant Ward clerk, and have been working with the High Priests Quorum President, as well as the Relief Society President and Young Women's President. According to the documentation for the newsletter:

Members with the following callings are default newsletter publishers:

High Priest group leaderElders Quorum presidentPrimary presidentRelief Society presidentSunday School presidentYoung Men presidentYoung Women president

However, when I had the HP Pres, RS Pres and YW Pres log in to the newsletter for our Ward, they didn't not have authoring/publishing rights. I had to assign them manually using the "Admin" function. To me this seems to be a bug, as the documentation states that they should have default publishing rights. Is anyone else having this issue?

They are all in the correct non-custom callings. When I, with my rights, went into the admin function of the newsletter, I was able to turn on administrative/authoring rights for them by adding them by title. I'd be interested if there's anyone else out there who could have their RS or HS or Elder's Quorum president verify that they can author an article in the newsletter with their standard calling rights. I thought it might be ok for one of them not to have those rights, but I had the Young Women's President, Relief Society President and also the High Priests Quorum Group Leader all try it - none of them could create a new article.